The UK has seen the third consecutive day with a record number of COVID vaccinations, after 844,285 people received a jab in the past 24 hours.
NHS England revealed during one hour on Saturday, jabs were given out at a rate of nearly 27 a second.
"In just one day we vaccinated the equivalent of the entire adult populations of Liverpool, Southampton and Oxford combined," NHS chief executive Sir Simon Stevens said.
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Prime Minister Boris Johnson announced the figure, tweeting: "A huge thank you to everyone involved and please come forward to get your jab when you are invited to do so."
The figure had been announced initially as 873,784 but the number of jabs in Scotland were then revised down.
The figure still equates to roughly 1.3% of the UK population receiving a vaccination in the past 24 hours - and means more than 2.24 million people have received a jab in the last three days.
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There have been a further 5,312 COVID-19 cases and another 33 people have died with coronavirus in the UK - the lowest death rate since 25 September - the latest daily figures show.
That compares with 96 deaths within 28 days of a positive test on Saturday, and a further 5,587 cases.
A total of 126,155 people have died within 28 days of a positive test, according to the figures. Where COVID-19 is mentioned on the death certificate, that figure is 146,487.
Defence secretary Ben Wallace warned "we can't be deaf and blind to what's going on outside the UK".
Speaking to Sophy Ridge on Sunday, he added: "We can't put at risk the gains of our vaccination campaign."
It comes as Boris Johnson is facing a Tory revolt over a move to extend emergency coronavirus laws, with one leading lockdown critic vowing to oppose the "excessive and disproportionate" powers.
Conservative former minister Steve Baker told Sophy Ridge he expected to vote "squarely against" the continuation of the "authoritarian" COVID-19 restrictions.
MPs are due to vote this week on keeping the coronavirus laws in place for another six months until October.
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